Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit t5500: give fully-qualified refs to fetch-pack (e9d866e)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "sideband.h"
  10
  11static struct remote *remote;
  12static const char *url; /* always ends with a trailing slash */
  13
  14struct options {
  15        int verbosity;
  16        unsigned long depth;
  17        unsigned progress : 1,
  18                followtags : 1,
  19                dry_run : 1,
  20                thin : 1;
  21};
  22static struct options options;
  23
  24static int set_option(const char *name, const char *value)
  25{
  26        if (!strcmp(name, "verbosity")) {
  27                char *end;
  28                int v = strtol(value, &end, 10);
  29                if (value == end || *end)
  30                        return -1;
  31                options.verbosity = v;
  32                return 0;
  33        }
  34        else if (!strcmp(name, "progress")) {
  35                if (!strcmp(value, "true"))
  36                        options.progress = 1;
  37                else if (!strcmp(value, "false"))
  38                        options.progress = 0;
  39                else
  40                        return -1;
  41                return 0;
  42        }
  43        else if (!strcmp(name, "depth")) {
  44                char *end;
  45                unsigned long v = strtoul(value, &end, 10);
  46                if (value == end || *end)
  47                        return -1;
  48                options.depth = v;
  49                return 0;
  50        }
  51        else if (!strcmp(name, "followtags")) {
  52                if (!strcmp(value, "true"))
  53                        options.followtags = 1;
  54                else if (!strcmp(value, "false"))
  55                        options.followtags = 0;
  56                else
  57                        return -1;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "dry-run")) {
  61                if (!strcmp(value, "true"))
  62                        options.dry_run = 1;
  63                else if (!strcmp(value, "false"))
  64                        options.dry_run = 0;
  65                else
  66                        return -1;
  67                return 0;
  68        }
  69        else {
  70                return 1 /* unsupported */;
  71        }
  72}
  73
  74struct discovery {
  75        const char *service;
  76        char *buf_alloc;
  77        char *buf;
  78        size_t len;
  79        unsigned proto_git : 1;
  80};
  81static struct discovery *last_discovery;
  82
  83static void free_discovery(struct discovery *d)
  84{
  85        if (d) {
  86                if (d == last_discovery)
  87                        last_discovery = NULL;
  88                free(d->buf_alloc);
  89                free(d);
  90        }
  91}
  92
  93static struct discovery* discover_refs(const char *service)
  94{
  95        struct strbuf buffer = STRBUF_INIT;
  96        struct discovery *last = last_discovery;
  97        char *refs_url;
  98        int http_ret, is_http = 0, proto_git_candidate = 1;
  99
 100        if (last && !strcmp(service, last->service))
 101                return last;
 102        free_discovery(last);
 103
 104        strbuf_addf(&buffer, "%sinfo/refs", url);
 105        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 106                is_http = 1;
 107                if (!strchr(url, '?'))
 108                        strbuf_addch(&buffer, '?');
 109                else
 110                        strbuf_addch(&buffer, '&');
 111                strbuf_addf(&buffer, "service=%s", service);
 112        }
 113        refs_url = strbuf_detach(&buffer, NULL);
 114
 115        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 116
 117        /* try again with "plain" url (no ? or & appended) */
 118        if (http_ret != HTTP_OK && http_ret != HTTP_NOAUTH) {
 119                free(refs_url);
 120                strbuf_reset(&buffer);
 121
 122                proto_git_candidate = 0;
 123                strbuf_addf(&buffer, "%sinfo/refs", url);
 124                refs_url = strbuf_detach(&buffer, NULL);
 125
 126                http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 127        }
 128
 129        switch (http_ret) {
 130        case HTTP_OK:
 131                break;
 132        case HTTP_MISSING_TARGET:
 133                die("%s not found: did you run git update-server-info on the"
 134                    " server?", refs_url);
 135        case HTTP_NOAUTH:
 136                die("Authentication failed");
 137        default:
 138                http_error(refs_url, http_ret);
 139                die("HTTP request failed");
 140        }
 141
 142        last= xcalloc(1, sizeof(*last_discovery));
 143        last->service = service;
 144        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 145        last->buf = last->buf_alloc;
 146
 147        if (is_http && proto_git_candidate
 148                && 5 <= last->len && last->buf[4] == '#') {
 149                /* smart HTTP response; validate that the service
 150                 * pkt-line matches our request.
 151                 */
 152                struct strbuf exp = STRBUF_INIT;
 153
 154                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 155                        die("%s has invalid packet header", refs_url);
 156                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 157                        strbuf_setlen(&buffer, buffer.len - 1);
 158
 159                strbuf_addf(&exp, "# service=%s", service);
 160                if (strbuf_cmp(&exp, &buffer))
 161                        die("invalid server response; got '%s'", buffer.buf);
 162                strbuf_release(&exp);
 163
 164                /* The header can include additional metadata lines, up
 165                 * until a packet flush marker.  Ignore these now, but
 166                 * in the future we might start to scan them.
 167                 */
 168                strbuf_reset(&buffer);
 169                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 170                        strbuf_reset(&buffer);
 171
 172                last->proto_git = 1;
 173        }
 174
 175        free(refs_url);
 176        strbuf_release(&buffer);
 177        last_discovery = last;
 178        return last;
 179}
 180
 181static int write_discovery(int in, int out, void *data)
 182{
 183        struct discovery *heads = data;
 184        int err = 0;
 185        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 186                err = 1;
 187        close(out);
 188        return err;
 189}
 190
 191static struct ref *parse_git_refs(struct discovery *heads)
 192{
 193        struct ref *list = NULL;
 194        struct async async;
 195
 196        memset(&async, 0, sizeof(async));
 197        async.proc = write_discovery;
 198        async.data = heads;
 199        async.out = -1;
 200
 201        if (start_async(&async))
 202                die("cannot start thread to parse advertised refs");
 203        get_remote_heads(async.out, &list, 0, NULL);
 204        close(async.out);
 205        if (finish_async(&async))
 206                die("ref parsing thread failed");
 207        return list;
 208}
 209
 210static struct ref *parse_info_refs(struct discovery *heads)
 211{
 212        char *data, *start, *mid;
 213        char *ref_name;
 214        int i = 0;
 215
 216        struct ref *refs = NULL;
 217        struct ref *ref = NULL;
 218        struct ref *last_ref = NULL;
 219
 220        data = heads->buf;
 221        start = NULL;
 222        mid = data;
 223        while (i < heads->len) {
 224                if (!start) {
 225                        start = &data[i];
 226                }
 227                if (data[i] == '\t')
 228                        mid = &data[i];
 229                if (data[i] == '\n') {
 230                        if (mid - start != 40)
 231                                die("%sinfo/refs not valid: is this a git repository?", url);
 232                        data[i] = 0;
 233                        ref_name = mid + 1;
 234                        ref = xmalloc(sizeof(struct ref) +
 235                                      strlen(ref_name) + 1);
 236                        memset(ref, 0, sizeof(struct ref));
 237                        strcpy(ref->name, ref_name);
 238                        get_sha1_hex(start, ref->old_sha1);
 239                        if (!refs)
 240                                refs = ref;
 241                        if (last_ref)
 242                                last_ref->next = ref;
 243                        last_ref = ref;
 244                        start = NULL;
 245                }
 246                i++;
 247        }
 248
 249        ref = alloc_ref("HEAD");
 250        if (!http_fetch_ref(url, ref) &&
 251            !resolve_remote_symref(ref, refs)) {
 252                ref->next = refs;
 253                refs = ref;
 254        } else {
 255                free(ref);
 256        }
 257
 258        return refs;
 259}
 260
 261static struct ref *get_refs(int for_push)
 262{
 263        struct discovery *heads;
 264
 265        if (for_push)
 266                heads = discover_refs("git-receive-pack");
 267        else
 268                heads = discover_refs("git-upload-pack");
 269
 270        if (heads->proto_git)
 271                return parse_git_refs(heads);
 272        return parse_info_refs(heads);
 273}
 274
 275static void output_refs(struct ref *refs)
 276{
 277        struct ref *posn;
 278        for (posn = refs; posn; posn = posn->next) {
 279                if (posn->symref)
 280                        printf("@%s %s\n", posn->symref, posn->name);
 281                else
 282                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 283        }
 284        printf("\n");
 285        fflush(stdout);
 286        free_refs(refs);
 287}
 288
 289struct rpc_state {
 290        const char *service_name;
 291        const char **argv;
 292        char *service_url;
 293        char *hdr_content_type;
 294        char *hdr_accept;
 295        char *buf;
 296        size_t alloc;
 297        size_t len;
 298        size_t pos;
 299        int in;
 300        int out;
 301        struct strbuf result;
 302        unsigned gzip_request : 1;
 303        unsigned initial_buffer : 1;
 304};
 305
 306static size_t rpc_out(void *ptr, size_t eltsize,
 307                size_t nmemb, void *buffer_)
 308{
 309        size_t max = eltsize * nmemb;
 310        struct rpc_state *rpc = buffer_;
 311        size_t avail = rpc->len - rpc->pos;
 312
 313        if (!avail) {
 314                rpc->initial_buffer = 0;
 315                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 316                if (!avail)
 317                        return 0;
 318                rpc->pos = 0;
 319                rpc->len = avail;
 320        }
 321
 322        if (max < avail)
 323                avail = max;
 324        memcpy(ptr, rpc->buf + rpc->pos, avail);
 325        rpc->pos += avail;
 326        return avail;
 327}
 328
 329#ifndef NO_CURL_IOCTL
 330static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 331{
 332        struct rpc_state *rpc = clientp;
 333
 334        switch (cmd) {
 335        case CURLIOCMD_NOP:
 336                return CURLIOE_OK;
 337
 338        case CURLIOCMD_RESTARTREAD:
 339                if (rpc->initial_buffer) {
 340                        rpc->pos = 0;
 341                        return CURLIOE_OK;
 342                }
 343                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 344                return CURLIOE_FAILRESTART;
 345
 346        default:
 347                return CURLIOE_UNKNOWNCMD;
 348        }
 349}
 350#endif
 351
 352static size_t rpc_in(char *ptr, size_t eltsize,
 353                size_t nmemb, void *buffer_)
 354{
 355        size_t size = eltsize * nmemb;
 356        struct rpc_state *rpc = buffer_;
 357        write_or_die(rpc->in, ptr, size);
 358        return size;
 359}
 360
 361static int run_slot(struct active_request_slot *slot)
 362{
 363        int err = 0;
 364        struct slot_results results;
 365
 366        slot->results = &results;
 367        slot->curl_result = curl_easy_perform(slot->curl);
 368        finish_active_slot(slot);
 369
 370        if (results.curl_result != CURLE_OK) {
 371                err |= error("RPC failed; result=%d, HTTP code = %ld",
 372                        results.curl_result, results.http_code);
 373        }
 374
 375        return err;
 376}
 377
 378static int probe_rpc(struct rpc_state *rpc)
 379{
 380        struct active_request_slot *slot;
 381        struct curl_slist *headers = NULL;
 382        struct strbuf buf = STRBUF_INIT;
 383        int err;
 384
 385        slot = get_active_slot();
 386
 387        headers = curl_slist_append(headers, rpc->hdr_content_type);
 388        headers = curl_slist_append(headers, rpc->hdr_accept);
 389
 390        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 391        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 392        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 393        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 394        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 395        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 396        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 397        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 398        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 399
 400        err = run_slot(slot);
 401
 402        curl_slist_free_all(headers);
 403        strbuf_release(&buf);
 404        return err;
 405}
 406
 407static int post_rpc(struct rpc_state *rpc)
 408{
 409        struct active_request_slot *slot;
 410        struct curl_slist *headers = NULL;
 411        int use_gzip = rpc->gzip_request;
 412        char *gzip_body = NULL;
 413        int err, large_request = 0;
 414
 415        /* Try to load the entire request, if we can fit it into the
 416         * allocated buffer space we can use HTTP/1.0 and avoid the
 417         * chunked encoding mess.
 418         */
 419        while (1) {
 420                size_t left = rpc->alloc - rpc->len;
 421                char *buf = rpc->buf + rpc->len;
 422                int n;
 423
 424                if (left < LARGE_PACKET_MAX) {
 425                        large_request = 1;
 426                        use_gzip = 0;
 427                        break;
 428                }
 429
 430                n = packet_read_line(rpc->out, buf, left);
 431                if (!n)
 432                        break;
 433                rpc->len += n;
 434        }
 435
 436        if (large_request) {
 437                err = probe_rpc(rpc);
 438                if (err)
 439                        return err;
 440        }
 441
 442        slot = get_active_slot();
 443
 444        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 445        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 446        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 447        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 448
 449        headers = curl_slist_append(headers, rpc->hdr_content_type);
 450        headers = curl_slist_append(headers, rpc->hdr_accept);
 451        headers = curl_slist_append(headers, "Expect:");
 452
 453        if (large_request) {
 454                /* The request body is large and the size cannot be predicted.
 455                 * We must use chunked encoding to send it.
 456                 */
 457                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 458                rpc->initial_buffer = 1;
 459                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 460                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 461#ifndef NO_CURL_IOCTL
 462                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 463                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 464#endif
 465                if (options.verbosity > 1) {
 466                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 467                        fflush(stderr);
 468                }
 469
 470        } else if (use_gzip && 1024 < rpc->len) {
 471                /* The client backend isn't giving us compressed data so
 472                 * we can try to deflate it ourselves, this may save on.
 473                 * the transfer time.
 474                 */
 475                size_t size;
 476                git_zstream stream;
 477                int ret;
 478
 479                memset(&stream, 0, sizeof(stream));
 480                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 481                size = git_deflate_bound(&stream, rpc->len);
 482                gzip_body = xmalloc(size);
 483
 484                stream.next_in = (unsigned char *)rpc->buf;
 485                stream.avail_in = rpc->len;
 486                stream.next_out = (unsigned char *)gzip_body;
 487                stream.avail_out = size;
 488
 489                ret = git_deflate(&stream, Z_FINISH);
 490                if (ret != Z_STREAM_END)
 491                        die("cannot deflate request; zlib deflate error %d", ret);
 492
 493                ret = git_deflate_end_gently(&stream);
 494                if (ret != Z_OK)
 495                        die("cannot deflate request; zlib end error %d", ret);
 496
 497                size = stream.total_out;
 498
 499                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 500                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 501                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 502
 503                if (options.verbosity > 1) {
 504                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 505                                rpc->service_name,
 506                                (unsigned long)rpc->len, (unsigned long)size);
 507                        fflush(stderr);
 508                }
 509        } else {
 510                /* We know the complete request size in advance, use the
 511                 * more normal Content-Length approach.
 512                 */
 513                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 514                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 515                if (options.verbosity > 1) {
 516                        fprintf(stderr, "POST %s (%lu bytes)\n",
 517                                rpc->service_name, (unsigned long)rpc->len);
 518                        fflush(stderr);
 519                }
 520        }
 521
 522        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 523        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 524        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 525
 526        err = run_slot(slot);
 527
 528        curl_slist_free_all(headers);
 529        free(gzip_body);
 530        return err;
 531}
 532
 533static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 534{
 535        const char *svc = rpc->service_name;
 536        struct strbuf buf = STRBUF_INIT;
 537        struct child_process client;
 538        int err = 0;
 539
 540        memset(&client, 0, sizeof(client));
 541        client.in = -1;
 542        client.out = -1;
 543        client.git_cmd = 1;
 544        client.argv = rpc->argv;
 545        if (start_command(&client))
 546                exit(1);
 547        if (heads)
 548                write_or_die(client.in, heads->buf, heads->len);
 549
 550        rpc->alloc = http_post_buffer;
 551        rpc->buf = xmalloc(rpc->alloc);
 552        rpc->in = client.in;
 553        rpc->out = client.out;
 554        strbuf_init(&rpc->result, 0);
 555
 556        strbuf_addf(&buf, "%s%s", url, svc);
 557        rpc->service_url = strbuf_detach(&buf, NULL);
 558
 559        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 560        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 561
 562        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 563        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 564
 565        while (!err) {
 566                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 567                if (!n)
 568                        break;
 569                rpc->pos = 0;
 570                rpc->len = n;
 571                err |= post_rpc(rpc);
 572        }
 573
 574        close(client.in);
 575        client.in = -1;
 576        if (!err) {
 577                strbuf_read(&rpc->result, client.out, 0);
 578        } else {
 579                char buf[4096];
 580                for (;;)
 581                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 582                                break;
 583        }
 584
 585        close(client.out);
 586        client.out = -1;
 587
 588        err |= finish_command(&client);
 589        free(rpc->service_url);
 590        free(rpc->hdr_content_type);
 591        free(rpc->hdr_accept);
 592        free(rpc->buf);
 593        strbuf_release(&buf);
 594        return err;
 595}
 596
 597static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 598{
 599        struct walker *walker;
 600        char **targets = xmalloc(nr_heads * sizeof(char*));
 601        int ret, i;
 602
 603        if (options.depth)
 604                die("dumb http transport does not support --depth");
 605        for (i = 0; i < nr_heads; i++)
 606                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 607
 608        walker = get_http_walker(url);
 609        walker->get_all = 1;
 610        walker->get_tree = 1;
 611        walker->get_history = 1;
 612        walker->get_verbosely = options.verbosity >= 3;
 613        walker->get_recover = 0;
 614        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 615        walker_free(walker);
 616
 617        for (i = 0; i < nr_heads; i++)
 618                free(targets[i]);
 619        free(targets);
 620
 621        return ret ? error("Fetch failed.") : 0;
 622}
 623
 624static int fetch_git(struct discovery *heads,
 625        int nr_heads, struct ref **to_fetch)
 626{
 627        struct rpc_state rpc;
 628        char *depth_arg = NULL;
 629        const char **argv;
 630        int argc = 0, i, err;
 631
 632        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 633        argv[argc++] = "fetch-pack";
 634        argv[argc++] = "--stateless-rpc";
 635        argv[argc++] = "--lock-pack";
 636        if (options.followtags)
 637                argv[argc++] = "--include-tag";
 638        if (options.thin)
 639                argv[argc++] = "--thin";
 640        if (options.verbosity >= 3) {
 641                argv[argc++] = "-v";
 642                argv[argc++] = "-v";
 643        }
 644        if (!options.progress)
 645                argv[argc++] = "--no-progress";
 646        if (options.depth) {
 647                struct strbuf buf = STRBUF_INIT;
 648                strbuf_addf(&buf, "--depth=%lu", options.depth);
 649                depth_arg = strbuf_detach(&buf, NULL);
 650                argv[argc++] = depth_arg;
 651        }
 652        argv[argc++] = url;
 653        for (i = 0; i < nr_heads; i++) {
 654                struct ref *ref = to_fetch[i];
 655                if (!ref->name || !*ref->name)
 656                        die("cannot fetch by sha1 over smart http");
 657                argv[argc++] = ref->name;
 658        }
 659        argv[argc++] = NULL;
 660
 661        memset(&rpc, 0, sizeof(rpc));
 662        rpc.service_name = "git-upload-pack",
 663        rpc.argv = argv;
 664        rpc.gzip_request = 1;
 665
 666        err = rpc_service(&rpc, heads);
 667        if (rpc.result.len)
 668                safe_write(1, rpc.result.buf, rpc.result.len);
 669        strbuf_release(&rpc.result);
 670        free(argv);
 671        free(depth_arg);
 672        return err;
 673}
 674
 675static int fetch(int nr_heads, struct ref **to_fetch)
 676{
 677        struct discovery *d = discover_refs("git-upload-pack");
 678        if (d->proto_git)
 679                return fetch_git(d, nr_heads, to_fetch);
 680        else
 681                return fetch_dumb(nr_heads, to_fetch);
 682}
 683
 684static void parse_fetch(struct strbuf *buf)
 685{
 686        struct ref **to_fetch = NULL;
 687        struct ref *list_head = NULL;
 688        struct ref **list = &list_head;
 689        int alloc_heads = 0, nr_heads = 0;
 690
 691        do {
 692                if (!prefixcmp(buf->buf, "fetch ")) {
 693                        char *p = buf->buf + strlen("fetch ");
 694                        char *name;
 695                        struct ref *ref;
 696                        unsigned char old_sha1[20];
 697
 698                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 699                                die("protocol error: expected sha/ref, got %s'", p);
 700                        if (p[40] == ' ')
 701                                name = p + 41;
 702                        else if (!p[40])
 703                                name = "";
 704                        else
 705                                die("protocol error: expected sha/ref, got %s'", p);
 706
 707                        ref = alloc_ref(name);
 708                        hashcpy(ref->old_sha1, old_sha1);
 709
 710                        *list = ref;
 711                        list = &ref->next;
 712
 713                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 714                        to_fetch[nr_heads++] = ref;
 715                }
 716                else
 717                        die("http transport does not support %s", buf->buf);
 718
 719                strbuf_reset(buf);
 720                if (strbuf_getline(buf, stdin, '\n') == EOF)
 721                        return;
 722                if (!*buf->buf)
 723                        break;
 724        } while (1);
 725
 726        if (fetch(nr_heads, to_fetch))
 727                exit(128); /* error already reported */
 728        free_refs(list_head);
 729        free(to_fetch);
 730
 731        printf("\n");
 732        fflush(stdout);
 733        strbuf_reset(buf);
 734}
 735
 736static int push_dav(int nr_spec, char **specs)
 737{
 738        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 739        int argc = 0, i;
 740
 741        argv[argc++] = "http-push";
 742        argv[argc++] = "--helper-status";
 743        if (options.dry_run)
 744                argv[argc++] = "--dry-run";
 745        if (options.verbosity > 1)
 746                argv[argc++] = "--verbose";
 747        argv[argc++] = url;
 748        for (i = 0; i < nr_spec; i++)
 749                argv[argc++] = specs[i];
 750        argv[argc++] = NULL;
 751
 752        if (run_command_v_opt(argv, RUN_GIT_CMD))
 753                die("git-%s failed", argv[0]);
 754        free(argv);
 755        return 0;
 756}
 757
 758static int push_git(struct discovery *heads, int nr_spec, char **specs)
 759{
 760        struct rpc_state rpc;
 761        const char **argv;
 762        int argc = 0, i, err;
 763
 764        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 765        argv[argc++] = "send-pack";
 766        argv[argc++] = "--stateless-rpc";
 767        argv[argc++] = "--helper-status";
 768        if (options.thin)
 769                argv[argc++] = "--thin";
 770        if (options.dry_run)
 771                argv[argc++] = "--dry-run";
 772        if (options.verbosity > 1)
 773                argv[argc++] = "--verbose";
 774        argv[argc++] = url;
 775        for (i = 0; i < nr_spec; i++)
 776                argv[argc++] = specs[i];
 777        argv[argc++] = NULL;
 778
 779        memset(&rpc, 0, sizeof(rpc));
 780        rpc.service_name = "git-receive-pack",
 781        rpc.argv = argv;
 782
 783        err = rpc_service(&rpc, heads);
 784        if (rpc.result.len)
 785                safe_write(1, rpc.result.buf, rpc.result.len);
 786        strbuf_release(&rpc.result);
 787        free(argv);
 788        return err;
 789}
 790
 791static int push(int nr_spec, char **specs)
 792{
 793        struct discovery *heads = discover_refs("git-receive-pack");
 794        int ret;
 795
 796        if (heads->proto_git)
 797                ret = push_git(heads, nr_spec, specs);
 798        else
 799                ret = push_dav(nr_spec, specs);
 800        free_discovery(heads);
 801        return ret;
 802}
 803
 804static void parse_push(struct strbuf *buf)
 805{
 806        char **specs = NULL;
 807        int alloc_spec = 0, nr_spec = 0, i;
 808
 809        do {
 810                if (!prefixcmp(buf->buf, "push ")) {
 811                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 812                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 813                }
 814                else
 815                        die("http transport does not support %s", buf->buf);
 816
 817                strbuf_reset(buf);
 818                if (strbuf_getline(buf, stdin, '\n') == EOF)
 819                        goto free_specs;
 820                if (!*buf->buf)
 821                        break;
 822        } while (1);
 823
 824        if (push(nr_spec, specs))
 825                exit(128); /* error already reported */
 826
 827        printf("\n");
 828        fflush(stdout);
 829
 830 free_specs:
 831        for (i = 0; i < nr_spec; i++)
 832                free(specs[i]);
 833        free(specs);
 834}
 835
 836int main(int argc, const char **argv)
 837{
 838        struct strbuf buf = STRBUF_INIT;
 839        int nongit;
 840
 841        git_extract_argv0_path(argv[0]);
 842        setup_git_directory_gently(&nongit);
 843        if (argc < 2) {
 844                fprintf(stderr, "Remote needed\n");
 845                return 1;
 846        }
 847
 848        options.verbosity = 1;
 849        options.progress = !!isatty(2);
 850        options.thin = 1;
 851
 852        remote = remote_get(argv[1]);
 853
 854        if (argc > 2) {
 855                end_url_with_slash(&buf, argv[2]);
 856        } else {
 857                end_url_with_slash(&buf, remote->url[0]);
 858        }
 859
 860        url = strbuf_detach(&buf, NULL);
 861
 862        http_init(remote, url);
 863
 864        do {
 865                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 866                        if (ferror(stdin))
 867                                fprintf(stderr, "Error reading command stream\n");
 868                        else
 869                                fprintf(stderr, "Unexpected end of command stream\n");
 870                        return 1;
 871                }
 872                if (buf.len == 0)
 873                        break;
 874                if (!prefixcmp(buf.buf, "fetch ")) {
 875                        if (nongit)
 876                                die("Fetch attempted without a local repo");
 877                        parse_fetch(&buf);
 878
 879                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 880                        int for_push = !!strstr(buf.buf + 4, "for-push");
 881                        output_refs(get_refs(for_push));
 882
 883                } else if (!prefixcmp(buf.buf, "push ")) {
 884                        parse_push(&buf);
 885
 886                } else if (!prefixcmp(buf.buf, "option ")) {
 887                        char *name = buf.buf + strlen("option ");
 888                        char *value = strchr(name, ' ');
 889                        int result;
 890
 891                        if (value)
 892                                *value++ = '\0';
 893                        else
 894                                value = "true";
 895
 896                        result = set_option(name, value);
 897                        if (!result)
 898                                printf("ok\n");
 899                        else if (result < 0)
 900                                printf("error invalid value\n");
 901                        else
 902                                printf("unsupported\n");
 903                        fflush(stdout);
 904
 905                } else if (!strcmp(buf.buf, "capabilities")) {
 906                        printf("fetch\n");
 907                        printf("option\n");
 908                        printf("push\n");
 909                        printf("\n");
 910                        fflush(stdout);
 911                } else {
 912                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 913                        return 1;
 914                }
 915                strbuf_reset(&buf);
 916        } while (1);
 917
 918        http_cleanup();
 919
 920        return 0;
 921}